So I looked up the class. The four ships of this class are the largest vessels in the Turkish Coast Guard. The next largest are only 210 tons. They are based on the Italian Sirio Class patrol vessels which operate under the Italian Navy but were paid for by the Transport and Navigation Ministry. I suspect the Sirio Class (appropriately modified) may have been the basis of the Marinette Marine’s OPC proposal.

Specs for the Turkish ships from my Combat Fleets of the World, 16th ed. with my translation to English units are:

Displacement: 1,700 tons (full load)

Overall Length: 88.4m (292 ft)

Length at Waterline: 80.3m (265 ft)

Beam: 12.2m (40.26 ft)

Draught: 4.6m (15.2 ft)

Speed: 22 knots

Power 4 MTU 16V, diesels, 2CP props, 14,120 BHP

The Gun: The Beda Bofors twin 40mm/70 gun is not a bad choice. It has been around for a while and it has improved over time. Current models are rated at 450 rounds per minute per barrel for 900 rounds per minute for the twin mount. That is faster than a .50 cal. M2 machine gun. The Italian Navy used this as a CIWS before switching to the improved 120 round per minute 76mm. It also has adequate range, 13,675 yards (12,500 m). This is less range than either a 57mm or 76mm, but adequate for most Coast Guard missions. There are at least for different projectiles available. The standard projectiles are about two pounds. There is also a high velocity solid tungsten alloy rod armour-piercing fin-stabilized discarding sabot (APFSDS) projectile that would probably be good for destroying fairly large diesel engines. .

If I read this correctly, the video is 380 rounds in 43 seconds.

Also from “Combat Fleets” this on the Turkish Coast Guard.

“Personnel: Approx. 2,200 total including 800 regulars and 1,400 conscripts, plus 1,050 on loan from the navy.

“Aviation: Coast Guard air assets include one Maule MX-7 light fixed-wing and three CASA CN-235 maritime patrol aircraft (the basic airframe for the HC-144, Chuck). Three Austa-Bell AB-206B Helicopters and thirteen search and rescue configured Agusta-Bell 412 helicopters. The aircraft are pained white with an orange diagonal stripe.”